<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>灰太狼</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        
        canvas {
            position: absolute;
            left: 50%;
            top: 50%;
            margin: -250px 0 0 -200px;
        }
    </style>
</head>

<body>
    <canvas width="400" height="500"></canvas>
    <script src="index.js"></script>
</body>

</html>